Frontier, Spirit sue US DOT over Washington Nat’l slots

Frontier Airlines (F9, Denver International) and Spirit Airlines (NK, Fort Lauderdale International) have sued the US Department of Transportation (DOT) over the allocation of slots at Washington National. Both argue that they should have been awarded two slots, while asserting that Alaska Airlines was ineligible due to its codeshare agreement with American Airlines.

In January 2025, Frontier Airlines petitioned the Court of Appeals for the District of Columbia Circuit to review the DOT’s order…